I don't think the morality should be particularly objectionable. It's "black and white" because the heroes tend to be nice people and the villains are almost invariably dog-raping monsters.

I found Mercedes Lackey to be fun to read, but not particularly deep or profound; they seem to have a bit of the romance novel in them. If you have some free time and want some feel-good entertainment, they're fine, but don't expect anything amazing; Mercedes Lackey is no Jacqueline Carey.